I can barely remember the old days when planting or potting a plant in a container was a once a season or at least once a year event. With the use of good potting soil that has a mix of peat moss, soil, maybe some perlite and other organic material your efforts should last quite a while but not with the PITA method.
The PITA method believes each pot should be emptied, chewed, the soil and plant scattered at LEAST two but probably more times. Sometimes as frequently as twice a month! When possible it is best to scatter the ingredients on the greenhouse floor as well as outside for more aeration.
If you enjoy potting and planting your pleasure is magnified with the addition of the PITA method. If you should want to try it, I might be able to let go of our PITA for you.;-)